This page describes the IBM SMS card "CY", and is part of the SMS card database.

Function of the card:
Ctrl power inverter
Power Inverter
CTDL-Power Inverter

Listed in 1401 SMS card usage

Complemented Transistor Diode Logic (CTDL) is IBM's term for a form of diode-transistor logic.

Complemented Transistor Resistor Logic (CTRL) is IBM's term for a form of resistor-transistor logic.

Part number: 371542

PCB number: 492219 , hole pattern: 491329

Used in: IBM 1401, IBM 1410, IBM 7070

Symbol:IP

IP: Inverter, Power. Performs function of an inverter white also driving a line.
IBM SMS card type CY 371542 IBM SMS card type CY 371542 IBM SMS card type CY 371542 IBM SMS card type CY 371542

Image courtesy of Henk Stegeman

References: 1410_SMS_VOL_2.pdf, p90
2_2 SMS Cards, p6
Coslet data
IBM Standard Modular System, Component Circuits, p62
This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.

The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.